implement reserved domains properly

https://tools.ietf.org/html/rfc6761#section-6

At least the **.localhost entries might be reasonable to override by the hints module (/etc/hosts), so that might be the proper place for implementation.

  • We should also consider automatically loading some modules by default (e.g. policy), because they implement functionality that is mandatory for resolvers. Loaded by default since 2.0.0.
Edited by Vladimír Čunát
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